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High-safety double-doped high-nickel ternary positive electrode material, preparation method thereof and lithium ion battery

A cathode material, double doping technology, applied in the direction of positive electrode, secondary battery, battery electrode, etc., can solve the problem of reducing the advantages of high specific capacity of high nickel ternary cathode materials, restricting the development and application of ternary cathode materials, and increasing processing. Process complexity and other issues, to reduce the probability of abnormal cell accidents, improve the force and bond energy between ions, and improve the high temperature cycle retention rate

Pending Publication Date: 2020-09-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of thermal stability in the existing technology is mostly achieved by sacrificing its specific capacity, or by taking three sinterings and increasing the complexity of the processing process.
These methods either reduce the high specific capacity advantage of the high-nickel ternary cathode material itself, or greatly increase the production cost, limiting the development and application of the ternary cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The invention provides a high-safety double-doped high-nickel ternary positive electrode material and a preparation method thereof, the method comprising the following steps:

[0070] ① Lithium hydroxide monohydrate and nickel-rich ternary cathode precursor Ni 0.83 co 0.11 mn 0.06 (OH) 2 , zirconia, strontium carbonate according to Li / Me (molar ratio, Me is the sum of nickel-cobalt-manganese)=1.04, the doping ratio of Zr and Sr in the polycrystalline nickel-cobalt-lithium manganese oxide matrix is ​​2000ppm and is uniformly mixed;

[0071] ②Put the uniformly mixed material into the atmosphere furnace, set the heating rate to 2°C / min, keep it at 760°C for 10 hours, the oxygen content in the atmosphere is 97vol%, and then cool with the furnace;

[0072] ③ The materials obtained from the primary sintering are subjected to roller crushing and ultra-centrifugal grinding and crushing in sequence, and then sieved through a 400-mesh sieve;

[0073] ④Wash the material obtain...

Embodiment 2

[0081] The invention provides a high-safety double-doped high-nickel ternary positive electrode material and a preparation method thereof, the method comprising the following steps:

[0082] ① Lithium hydroxide monohydrate and nickel-rich ternary cathode precursor Ni 0.83 co 0.11 mn 0.06 (OH) 2 , zirconia, strontium carbonate according to Li / Me (molar ratio, Me is the sum of nickel-cobalt-manganese)=1.04, the doping ratio of Zr and Sr in the polycrystalline nickel-cobalt-lithium manganese oxide matrix is ​​2000ppm and is uniformly mixed;

[0083] ② Put the uniformly mixed material into the atmosphere furnace, set the heating rate to 2°C / min, keep it at 760°C for 10h, the atmosphere is oxygen atmosphere, and then cool with the furnace;

[0084] ③ The materials obtained from the primary sintering are subjected to roller crushing and ultra-centrifugal grinding and crushing in sequence, and then sieved through a 400-mesh sieve;

[0085] ④Wash the material obtained after sievin...

Embodiment 3

[0091] The invention provides a high-safety double-doped high-nickel ternary positive electrode material and a preparation method thereof, the method comprising the following steps:

[0092] ① Lithium hydroxide monohydrate and nickel-rich ternary cathode precursor Ni 0.83 co 0.11 mn 0.06 (OH) 2 , zirconium oxide, strontium hydroxide according to Li / Me (molar ratio, Me is the sum of nickel-cobalt-manganese)=1.04, and the doping ratio of Zr and Sr in the polycrystalline nickel-cobalt-lithium manganese oxide matrix is ​​2000ppm and is uniformly mixed;

[0093] ②Put the uniformly mixed material into the atmosphere furnace, set the heating rate to 2°C / min, keep it at 760°C for 10 hours, the oxygen content in the atmosphere is 98vol%, and then cool with the furnace;

[0094] ③ The materials obtained from the primary sintering are subjected to roller crushing and ultra-centrifugal grinding and crushing in sequence, and then sieved through a 400-mesh sieve;

[0095] ④Wash the mate...

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Abstract

The invention discloses a high-safety double-doped high-nickel ternary positive electrode material, a preparation method thereof and a lithium ion battery. The high-nickel ternary positive electrode material comprises a polycrystalline nickel cobalt lithium manganate matrix, wherein the molar content of Ni element in the polycrystalline nickel cobalt lithium manganate matrix accounts for more than80% of the total molar weight of Ni, Co and Mn, and Zr and Sr elements are doped in the polycrystalline nickel cobalt lithium manganate ternary positive electrode matrix. Compared with the prior art,the high-nickel ternary positive electrode material has the advantage that the thermal stability of the high-nickel ternary positive electrode material is remarkably improved on the premise of not reducing the proportion of the Ni element in the high-nickel ternary positive electrode material, namely, not reducing the specific capacity of the high-nickel ternary positive electrode material. Meanwhile, the price of the nickel element is far lower than that of the cobalt element, so that the nickel element accounts for a high proportion, transition metals such as cobalt account for a low proportion, and the advantage of reducing the cost of raw materials is considered.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and relates to a high-safety double-doped high-nickel ternary positive electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] As one of the green energy sources in the 21st century, reversible secondary batteries have undergone decades of development from lead-acid batteries to current lithium-ion batteries, and have achieved great results in terms of energy density, cycle life, volume and weight, and environmental protection. The progress of the earth has changed from being only used in 3C digital devices such as mobile phones, laptops, and cameras to the power lithium-ion batteries that can be applied to hybrid electric vehicles or even pure electric vehicles, thus bringing people's lives Great convenience. [0003] Lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and lithium nickel manganese cobalt oxide t...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2006/40Y02E60/10
Inventor 楚志颖崔军燕陈修好李嘉俊
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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